Avaya Communication Manager Administrator's Manual page 1612

Feature Reference
Multifrequency signaling
•
You can record an announcement to play when outgoing R2-MFC trunk calls do not complete.
This applies when Communication Manager receives either group A or B signals from the called
Central Office or other media server or switch. See
on page 1076 for more information.
Guidelines for administering MF signaling
To administer MF signaling, first you identify the origination and destination media servers or switches.
(The one making the call is the origination server; the one answering the call is the destination server.)
•
The origination server/switch creates forward signals, classified as group I and group II signals.
•
The destination server/switch creates backward signals, classified as group A and group B
signals.
Group I and group A signals comprise the basic signaling for the dialed number. More elaborate signaling
requires Group II and group B signals. Signal meanings and timer values can be administered.
The sequence below shows a typical interaction between the origination server (forward group I and
group II signals) and destination server (backward group A and group B signals).
Forward
Group I
Group II
1612
Backward
digit -->
<-- A.1 Group A
digit -->
<-- A.1
digit -->
<-- A.1
digit -->
<-- A.1
digit -->
<-- A.3 End of dial
II.2 -->
<-- B.x Group B
Administrator's Guide for Avaya Communication Manager
Multifrequency-Signaling-Related Parameters
November 2003